release/src/router/libevent/bufferevent_sock.c

   1 /*
   2  * Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
   3  * Copyright (c) 2002-2006 Niels Provos <provos@citi.umich.edu>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/types.h>
  30
  31 #include "event2/event-config.h"
  32
  33 #ifdef _EVENT_HAVE_SYS_TIME_H
  34 #include <sys/time.h>
  35 #endif
  36
  37 #include <errno.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #ifdef _EVENT_HAVE_STDARG_H
  42 #include <stdarg.h>
  43 #endif
  44 #ifdef _EVENT_HAVE_UNISTD_H
  45 #include <unistd.h>
  46 #endif
  47
  48 #ifdef WIN32
  49 #include <winsock2.h>
  50 #include <ws2tcpip.h>
  51 #endif
  52
  53 #ifdef _EVENT_HAVE_SYS_SOCKET_H
  54 #include <sys/socket.h>
  55 #endif
  56 #ifdef _EVENT_HAVE_NETINET_IN_H
  57 #include <netinet/in.h>
  58 #endif
  59 #ifdef _EVENT_HAVE_NETINET_IN6_H
  60 #include <netinet/in6.h>
  61 #endif
  62
  63 #include "event2/util.h"
  64 #include "event2/bufferevent.h"
  65 #include "event2/buffer.h"
  66 #include "event2/bufferevent_struct.h"
  67 #include "event2/bufferevent_compat.h"
  68 #include "event2/event.h"
  69 #include "log-internal.h"
  70 #include "mm-internal.h"
  71 #include "bufferevent-internal.h"
  72 #include "util-internal.h"
  73 #ifdef WIN32
  74 #include "iocp-internal.h"
  75 #endif
  76
  77 /* prototypes */
  78 static int be_socket_enable(struct bufferevent *, short);
  79 static int be_socket_disable(struct bufferevent *, short);
  80 static void be_socket_destruct(struct bufferevent *);
  81 static int be_socket_adj_timeouts(struct bufferevent *);
  82 static int be_socket_flush(struct bufferevent *, short, enum bufferevent_flush_mode);
  83 static int be_socket_ctrl(struct bufferevent *, enum bufferevent_ctrl_op, union bufferevent_ctrl_data *);
  84
  85 static void be_socket_setfd(struct bufferevent *, evutil_socket_t);
  86
  87 const struct bufferevent_ops bufferevent_ops_socket = {
  88         "socket",
  89         evutil_offsetof(struct bufferevent_private, bev),
  90         be_socket_enable,
  91         be_socket_disable,
  92         be_socket_destruct,
  93         be_socket_adj_timeouts,
  94         be_socket_flush,
  95         be_socket_ctrl,
  96 };
  97
  98 #define be_socket_add(ev, t)                    \
  99         _bufferevent_add_event((ev), (t))
 100
 101 static void
 102 bufferevent_socket_outbuf_cb(struct evbuffer *buf,
 103     const struct evbuffer_cb_info *cbinfo,
 104     void *arg)
 105 {
 106         struct bufferevent *bufev = arg;
 107         struct bufferevent_private *bufev_p =
 108             EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
 109
 110         if (cbinfo->n_added &&
 111             (bufev->enabled & EV_WRITE) &&
 112             !event_pending(&bufev->ev_write, EV_WRITE, NULL) &&
 113             !bufev_p->write_suspended) {
 114                 /* Somebody added data to the buffer, and we would like to
 115                  * write, and we were not writing.  So, start writing. */
 116                 be_socket_add(&bufev->ev_write, &bufev->timeout_write);
 117                 /* XXXX handle failure from be_socket_add */
 118         }
 119 }
 120
 121 static void
 122 bufferevent_readcb(evutil_socket_t fd, short event, void *arg)
 123 {
 124         struct bufferevent *bufev = arg;
 125         struct bufferevent_private *bufev_p =
 126             EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
 127         struct evbuffer *input;
 128         int res = 0;
 129         short what = BEV_EVENT_READING;
 130         ev_ssize_t howmuch = -1, readmax=-1;
 131
 132         _bufferevent_incref_and_lock(bufev);
 133
 134         if (event == EV_TIMEOUT) {
 135                 what |= BEV_EVENT_TIMEOUT;
 136                 goto error;
 137         }
 138
 139         input = bufev->input;
 140
 141         /*
 142          * If we have a high watermark configured then we don't want to
 143          * read more data than would make us reach the watermark.
 144          */
 145         if (bufev->wm_read.high != 0) {
 146                 howmuch = bufev->wm_read.high - evbuffer_get_length(input);
 147                 /* we somehow lowered the watermark, stop reading */
 148                 if (howmuch <= 0) {
 149                         bufferevent_wm_suspend_read(bufev);
 150                         goto done;
 151                 }
 152         }
 153         readmax = _bufferevent_get_read_max(bufev_p);
 154         if (howmuch < 0 || howmuch > readmax) /* The use of -1 for "unlimited"
 155                                                * uglifies this code. XXXX */
 156                 howmuch = readmax;
 157         if (bufev_p->read_suspended)
 158                 goto done;
 159
 160         evbuffer_unfreeze(input, 0);
 161         res = evbuffer_read(input, fd, (int)howmuch); /* XXXX evbuffer_read would do better to take and return ev_ssize_t */
 162         evbuffer_freeze(input, 0);
 163
 164         if (res == -1) {
 165                 int err = evutil_socket_geterror(fd);
 166                 if (EVUTIL_ERR_RW_RETRIABLE(err))
 167                         goto reschedule;
 168                 /* error case */
 169                 what |= BEV_EVENT_ERROR;
 170         } else if (res == 0) {
 171                 /* eof case */
 172                 what |= BEV_EVENT_EOF;
 173         }
 174
 175         if (res <= 0)
 176                 goto error;
 177
 178         _bufferevent_decrement_read_buckets(bufev_p, res);
 179
 180         /* Invoke the user callback - must always be called last */
 181         if (evbuffer_get_length(input) >= bufev->wm_read.low)
 182                 _bufferevent_run_readcb(bufev);
 183
 184         goto done;
 185
 186  reschedule:
 187         goto done;
 188
 189  error:
 190         bufferevent_disable(bufev, EV_READ);
 191         _bufferevent_run_eventcb(bufev, what);
 192
 193  done:
 194         _bufferevent_decref_and_unlock(bufev);
 195 }
 196
 197 static void
 198 bufferevent_writecb(evutil_socket_t fd, short event, void *arg)
 199 {
 200         struct bufferevent *bufev = arg;
 201         struct bufferevent_private *bufev_p =
 202             EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
 203         int res = 0;
 204         short what = BEV_EVENT_WRITING;
 205         int connected = 0;
 206         ev_ssize_t atmost = -1;
 207
 208         _bufferevent_incref_and_lock(bufev);
 209
 210         if (event == EV_TIMEOUT) {
 211                 what |= BEV_EVENT_TIMEOUT;
 212                 goto error;
 213         }
 214         if (bufev_p->connecting) {
 215                 int c = evutil_socket_finished_connecting(fd);
 216                 /* we need to fake the error if the connection was refused
 217                  * immediately - usually connection to localhost on BSD */
 218                 if (bufev_p->connection_refused) {
 219                   bufev_p->connection_refused = 0;
 220                   c = -1;
 221                 }
 222
 223                 if (c == 0)
 224                         goto done;
 225
 226                 bufev_p->connecting = 0;
 227                 if (c < 0) {
 228                         event_del(&bufev->ev_write);
 229                         event_del(&bufev->ev_read);
 230                         _bufferevent_run_eventcb(bufev, BEV_EVENT_ERROR);
 231                         goto done;
 232                 } else {
 233                         connected = 1;
 234 #ifdef WIN32
 235                         if (BEV_IS_ASYNC(bufev)) {
 236                                 event_del(&bufev->ev_write);
 237                                 bufferevent_async_set_connected(bufev);
 238                                 _bufferevent_run_eventcb(bufev,
 239                                                 BEV_EVENT_CONNECTED);
 240                                 goto done;
 241                         }
 242 #endif
 243                         _bufferevent_run_eventcb(bufev,
 244                                         BEV_EVENT_CONNECTED);
 245                         if (!(bufev->enabled & EV_WRITE) ||
 246                             bufev_p->write_suspended) {
 247                                 event_del(&bufev->ev_write);
 248                                 goto done;
 249                         }
 250                 }
 251         }
 252
 253         atmost = _bufferevent_get_write_max(bufev_p);
 254
 255         if (bufev_p->write_suspended)
 256                 goto done;
 257
 258         if (evbuffer_get_length(bufev->output)) {
 259                 evbuffer_unfreeze(bufev->output, 1);
 260                 res = evbuffer_write_atmost(bufev->output, fd, atmost);
 261                 evbuffer_freeze(bufev->output, 1);
 262                 if (res == -1) {
 263                         int err = evutil_socket_geterror(fd);
 264                         if (EVUTIL_ERR_RW_RETRIABLE(err))
 265                                 goto reschedule;
 266                         what |= BEV_EVENT_ERROR;
 267                 } else if (res == 0) {
 268                         /* eof case
 269                            XXXX Actually, a 0 on write doesn't indicate
 270                            an EOF. An ECONNRESET might be more typical.
 271                          */
 272                         what |= BEV_EVENT_EOF;
 273                 }
 274                 if (res <= 0)
 275                         goto error;
 276
 277                 _bufferevent_decrement_write_buckets(bufev_p, res);
 278         }
 279
 280         if (evbuffer_get_length(bufev->output) == 0) {
 281                 event_del(&bufev->ev_write);
 282         }
 283
 284         /*
 285          * Invoke the user callback if our buffer is drained or below the
 286          * low watermark.
 287          */
 288         if ((res || !connected) &&
 289             evbuffer_get_length(bufev->output) <= bufev->wm_write.low) {
 290                 _bufferevent_run_writecb(bufev);
 291         }
 292
 293         goto done;
 294
 295  reschedule:
 296         if (evbuffer_get_length(bufev->output) == 0) {
 297                 event_del(&bufev->ev_write);
 298         }
 299         goto done;
 300
 301  error:
 302         bufferevent_disable(bufev, EV_WRITE);
 303         _bufferevent_run_eventcb(bufev, what);
 304
 305  done:
 306         _bufferevent_decref_and_unlock(bufev);
 307 }
 308
 309 struct bufferevent *
 310 bufferevent_socket_new(struct event_base *base, evutil_socket_t fd,
 311     int options)
 312 {
 313         struct bufferevent_private *bufev_p;
 314         struct bufferevent *bufev;
 315
 316 #ifdef WIN32
 317         if (base && event_base_get_iocp(base))
 318                 return bufferevent_async_new(base, fd, options);
 319 #endif
 320
 321         if ((bufev_p = mm_calloc(1, sizeof(struct bufferevent_private)))== NULL)
 322                 return NULL;
 323
 324         if (bufferevent_init_common(bufev_p, base, &bufferevent_ops_socket,
 325                                     options) < 0) {
 326                 mm_free(bufev_p);
 327                 return NULL;
 328         }
 329         bufev = &bufev_p->bev;
 330
 331         event_assign(&bufev->ev_read, bufev->ev_base, fd,
 332             EV_READ|EV_PERSIST, bufferevent_readcb, bufev);
 333         event_assign(&bufev->ev_write, bufev->ev_base, fd,
 334             EV_WRITE|EV_PERSIST, bufferevent_writecb, bufev);
 335
 336         evbuffer_add_cb(bufev->output, bufferevent_socket_outbuf_cb, bufev);
 337
 338         evbuffer_freeze(bufev->input, 0);
 339         evbuffer_freeze(bufev->output, 1);
 340
 341         return bufev;
 342 }
 343
 344 int
 345 bufferevent_socket_connect(struct bufferevent *bev,
 346     struct sockaddr *sa, int socklen)
 347 {
 348         struct bufferevent_private *bufev_p =
 349             EVUTIL_UPCAST(bev, struct bufferevent_private, bev);
 350
 351         evutil_socket_t fd;
 352         int r = 0;
 353         int result=-1;
 354         int ownfd = 0;
 355
 356         _bufferevent_incref_and_lock(bev);
 357
 358         if (!bufev_p)
 359                 goto done;
 360
 361         fd = bufferevent_getfd(bev);
 362         if (fd < 0) {
 363                 if (!sa)
 364                         goto done;
 365                 fd = socket(sa->sa_family, SOCK_STREAM, 0);
 366                 if (fd < 0)
 367                         goto done;
 368                 if (evutil_make_socket_nonblocking(fd)<0)
 369                         goto done;
 370                 ownfd = 1;
 371         }
 372         if (sa) {
 373 #ifdef WIN32
 374                 if (bufferevent_async_can_connect(bev)) {
 375                         bufferevent_setfd(bev, fd);
 376                         r = bufferevent_async_connect(bev, fd, sa, socklen);
 377                         if (r < 0)
 378                                 goto freesock;
 379                         bufev_p->connecting = 1;
 380                         result = 0;
 381                         goto done;
 382                 } else
 383 #endif
 384                 r = evutil_socket_connect(&fd, sa, socklen);
 385                 if (r < 0)
 386                         goto freesock;
 387         }
 388 #ifdef WIN32
 389         /* ConnectEx() isn't always around, even when IOCP is enabled.
 390          * Here, we borrow the socket object's write handler to fall back
 391          * on a non-blocking connect() when ConnectEx() is unavailable. */
 392         if (BEV_IS_ASYNC(bev)) {
 393                 event_assign(&bev->ev_write, bev->ev_base, fd,
 394                     EV_WRITE|EV_PERSIST, bufferevent_writecb, bev);
 395         }
 396 #endif
 397         bufferevent_setfd(bev, fd);
 398         if (r == 0) {
 399                 if (! be_socket_enable(bev, EV_WRITE)) {
 400                         bufev_p->connecting = 1;
 401                         result = 0;
 402                         goto done;
 403                 }
 404         } else if (r == 1) {
 405                 /* The connect succeeded already. How very BSD of it. */
 406                 result = 0;
 407                 bufev_p->connecting = 1;
 408                 event_active(&bev->ev_write, EV_WRITE, 1);
 409         } else {
 410                 /* The connect failed already.  How very BSD of it. */
 411                 bufev_p->connection_refused = 1;
 412                 bufev_p->connecting = 1;
 413                 result = 0;
 414                 event_active(&bev->ev_write, EV_WRITE, 1);
 415         }
 416
 417         goto done;
 418
 419 freesock:
 420         _bufferevent_run_eventcb(bev, BEV_EVENT_ERROR);
 421         if (ownfd)
 422                 evutil_closesocket(fd);
 423         /* do something about the error? */
 424 done:
 425         _bufferevent_decref_and_unlock(bev);
 426         return result;
 427 }
 428
 429 static void
 430 bufferevent_connect_getaddrinfo_cb(int result, struct evutil_addrinfo *ai,
 431     void *arg)
 432 {
 433         struct bufferevent *bev = arg;
 434         struct bufferevent_private *bev_p =
 435             EVUTIL_UPCAST(bev, struct bufferevent_private, bev);
 436         int r;
 437         BEV_LOCK(bev);
 438
 439         bufferevent_unsuspend_write(bev, BEV_SUSPEND_LOOKUP);
 440         bufferevent_unsuspend_read(bev, BEV_SUSPEND_LOOKUP);
 441
 442         if (result != 0) {
 443                 bev_p->dns_error = result;
 444                 _bufferevent_run_eventcb(bev, BEV_EVENT_ERROR);
 445                 _bufferevent_decref_and_unlock(bev);
 446                 if (ai)
 447                         evutil_freeaddrinfo(ai);
 448                 return;
 449         }
 450
 451         /* XXX use the other addrinfos? */
 452         /* XXX use this return value */
 453         r = bufferevent_socket_connect(bev, ai->ai_addr, (int)ai->ai_addrlen);
 454         (void)r;
 455         _bufferevent_decref_and_unlock(bev);
 456         evutil_freeaddrinfo(ai);
 457 }
 458
 459 int
 460 bufferevent_socket_connect_hostname(struct bufferevent *bev,
 461     struct evdns_base *evdns_base, int family, const char *hostname, int port)
 462 {
 463         char portbuf[10];
 464         struct evutil_addrinfo hint;
 465         int err;
 466         struct bufferevent_private *bev_p =
 467             EVUTIL_UPCAST(bev, struct bufferevent_private, bev);
 468
 469         if (family != AF_INET && family != AF_INET6 && family != AF_UNSPEC)
 470                 return -1;
 471         if (port < 1 || port > 65535)
 472                 return -1;
 473
 474         BEV_LOCK(bev);
 475         bev_p->dns_error = 0;
 476         BEV_UNLOCK(bev);
 477
 478         evutil_snprintf(portbuf, sizeof(portbuf), "%d", port);
 479
 480         memset(&hint, 0, sizeof(hint));
 481         hint.ai_family = family;
 482         hint.ai_protocol = IPPROTO_TCP;
 483         hint.ai_socktype = SOCK_STREAM;
 484
 485         bufferevent_suspend_write(bev, BEV_SUSPEND_LOOKUP);
 486         bufferevent_suspend_read(bev, BEV_SUSPEND_LOOKUP);
 487
 488         bufferevent_incref(bev);
 489         err = evutil_getaddrinfo_async(evdns_base, hostname, portbuf,
 490             &hint, bufferevent_connect_getaddrinfo_cb, bev);
 491
 492         if (err == 0) {
 493                 return 0;
 494         } else {
 495                 bufferevent_unsuspend_write(bev, BEV_SUSPEND_LOOKUP);
 496                 bufferevent_unsuspend_read(bev, BEV_SUSPEND_LOOKUP);
 497                 return -1;
 498         }
 499 }
 500
 501 int
 502 bufferevent_socket_get_dns_error(struct bufferevent *bev)
 503 {
 504         int rv;
 505         struct bufferevent_private *bev_p =
 506             EVUTIL_UPCAST(bev, struct bufferevent_private, bev);
 507
 508         BEV_LOCK(bev);
 509         rv = bev_p->dns_error;
 510         BEV_LOCK(bev);
 511
 512         return rv;
 513 }
 514
 515 /*
 516  * Create a new buffered event object.
 517  *
 518  * The read callback is invoked whenever we read new data.
 519  * The write callback is invoked whenever the output buffer is drained.
 520  * The error callback is invoked on a write/read error or on EOF.
 521  *
 522  * Both read and write callbacks maybe NULL.  The error callback is not
 523  * allowed to be NULL and have to be provided always.
 524  */
 525
 526 struct bufferevent *
 527 bufferevent_new(evutil_socket_t fd,
 528     bufferevent_data_cb readcb, bufferevent_data_cb writecb,
 529     bufferevent_event_cb eventcb, void *cbarg)
 530 {
 531         struct bufferevent *bufev;
 532
 533         if (!(bufev = bufferevent_socket_new(NULL, fd, 0)))
 534                 return NULL;
 535
 536         bufferevent_setcb(bufev, readcb, writecb, eventcb, cbarg);
 537
 538         return bufev;
 539 }
 540
 541
 542 static int
 543 be_socket_enable(struct bufferevent *bufev, short event)
 544 {
 545         if (event & EV_READ) {
 546                 if (be_socket_add(&bufev->ev_read,&bufev->timeout_read) == -1)
 547                         return -1;
 548         }
 549         if (event & EV_WRITE) {
 550                 if (be_socket_add(&bufev->ev_write,&bufev->timeout_write) == -1)
 551                         return -1;
 552         }
 553         return 0;
 554 }
 555
 556 static int
 557 be_socket_disable(struct bufferevent *bufev, short event)
 558 {
 559         struct bufferevent_private *bufev_p =
 560             EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
 561         if (event & EV_READ) {
 562                 if (event_del(&bufev->ev_read) == -1)
 563                         return -1;
 564         }
 565         /* Don't actually disable the write if we are trying to connect. */
 566         if ((event & EV_WRITE) && ! bufev_p->connecting) {
 567                 if (event_del(&bufev->ev_write) == -1)
 568                         return -1;
 569         }
 570         return 0;
 571 }
 572
 573 static void
 574 be_socket_destruct(struct bufferevent *bufev)
 575 {
 576         struct bufferevent_private *bufev_p =
 577             EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
 578         evutil_socket_t fd;
 579         EVUTIL_ASSERT(bufev->be_ops == &bufferevent_ops_socket);
 580
 581         fd = event_get_fd(&bufev->ev_read);
 582
 583         event_del(&bufev->ev_read);
 584         event_del(&bufev->ev_write);
 585
 586         if ((bufev_p->options & BEV_OPT_CLOSE_ON_FREE) && fd >= 0)
 587                 EVUTIL_CLOSESOCKET(fd);
 588 }
 589
 590 static int
 591 be_socket_adj_timeouts(struct bufferevent *bufev)
 592 {
 593         int r = 0;
 594         if (event_pending(&bufev->ev_read, EV_READ, NULL))
 595                 if (be_socket_add(&bufev->ev_read, &bufev->timeout_read) < 0)
 596                         r = -1;
 597         if (event_pending(&bufev->ev_write, EV_WRITE, NULL)) {
 598                 if (be_socket_add(&bufev->ev_write, &bufev->timeout_write) < 0)
 599                         r = -1;
 600         }
 601         return r;
 602 }
 603
 604 static int
 605 be_socket_flush(struct bufferevent *bev, short iotype,
 606     enum bufferevent_flush_mode mode)
 607 {
 608         return 0;
 609 }
 610
 611
 612 static void
 613 be_socket_setfd(struct bufferevent *bufev, evutil_socket_t fd)
 614 {
 615         BEV_LOCK(bufev);
 616         EVUTIL_ASSERT(bufev->be_ops == &bufferevent_ops_socket);
 617
 618         event_del(&bufev->ev_read);
 619         event_del(&bufev->ev_write);
 620
 621         event_assign(&bufev->ev_read, bufev->ev_base, fd,
 622             EV_READ|EV_PERSIST, bufferevent_readcb, bufev);
 623         event_assign(&bufev->ev_write, bufev->ev_base, fd,
 624             EV_WRITE|EV_PERSIST, bufferevent_writecb, bufev);
 625
 626         if (fd >= 0)
 627                 bufferevent_enable(bufev, bufev->enabled);
 628
 629         BEV_UNLOCK(bufev);
 630 }
 631
 632 /* XXXX Should non-socket bufferevents support this? */
 633 int
 634 bufferevent_priority_set(struct bufferevent *bufev, int priority)
 635 {
 636         int r = -1;
 637
 638         BEV_LOCK(bufev);
 639         if (bufev->be_ops != &bufferevent_ops_socket)
 640                 goto done;
 641
 642         if (event_priority_set(&bufev->ev_read, priority) == -1)
 643                 goto done;
 644         if (event_priority_set(&bufev->ev_write, priority) == -1)
 645                 goto done;
 646
 647         r = 0;
 648 done:
 649         BEV_UNLOCK(bufev);
 650         return r;
 651 }
 652
 653 /* XXXX Should non-socket bufferevents support this? */
 654 int
 655 bufferevent_base_set(struct event_base *base, struct bufferevent *bufev)
 656 {
 657         int res = -1;
 658
 659         BEV_LOCK(bufev);
 660         if (bufev->be_ops != &bufferevent_ops_socket)
 661                 goto done;
 662
 663         bufev->ev_base = base;
 664
 665         res = event_base_set(base, &bufev->ev_read);
 666         if (res == -1)
 667                 goto done;
 668
 669         res = event_base_set(base, &bufev->ev_write);
 670 done:
 671         BEV_UNLOCK(bufev);
 672         return res;
 673 }
 674
 675 static int
 676 be_socket_ctrl(struct bufferevent *bev, enum bufferevent_ctrl_op op,
 677     union bufferevent_ctrl_data *data)
 678 {
 679         switch (op) {
 680         case BEV_CTRL_SET_FD:
 681                 be_socket_setfd(bev, data->fd);
 682                 return 0;
 683         case BEV_CTRL_GET_FD:
 684                 data->fd = event_get_fd(&bev->ev_read);
 685                 return 0;
 686         case BEV_CTRL_GET_UNDERLYING:
 687         default:
 688                 return -1;
 689         }
 690 }